Two swimmers leave point `A` on one bank of the river to reach point `B` lying right across on the other bank. One of them crosses the river along the straight line `AB` while the other swims at right angles to the stream and them walks the distance that he has been carried by the stream to get to point `B`. what was the velocity `v_(0)` of his walking if both swimmers reach the destination simultaneously? The stream velocity is `u` and `v` is the velocity of swimmer in still water.

Explanation

To solve the problem of the two swimmers reaching point B simultaneously, we can break down the solution into clear steps.

### Step-by-Step Solution:

1. **Define the Variables**:
- Let \( u \) be the velocity of the stream.
- Let \( v \) be the velocity of the swimmer in still water.
- Let \( D \) be the width of the river (the distance from point A to point B directly across).
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